<template>
    <div>
        <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon
            :closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"  @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                        v-model="addForm.goods_cat"
                        :options="catelist"
                        expand-trigger='hover'
                        @change="handleChange"
                        :props="cateProps">
                    </el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key='item.attr_id'>
                    <!-- 复选框组 -->
                    <el-checkbox-group   v-model="item.attr_vals" >
                        <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key='i'></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key='item.attr_id'>
                    <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- action 表示图片要上传到的后台API地址 -->
                <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture"
                    :headers="headerObj"
                    :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器 -->
                <quill-editor v-model="addForm.goods_introdece"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
        </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'

export default {
    data(){
        return {
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品的详情描述
                goods_introdece:'',
                attrs:[]
            },
            // 验证表单
            addFormRules:{
                goods_name:[{ required: true, message: '请输入商品名称', trigger: 'blur' }],
                goods_price:[{ required: true, message: '请输入商品价格', trigger: 'blur' }],
                goods_weight:[{ required: true, message: '请输入商品重量', trigger: 'blur' }],
                goods_number:[{ required: true, message: '请输入商品数量', trigger: 'blur' }],
                goods_cat:[{ required: true, message: '请选择商品分类', trigger: 'blur' }],
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                chiildren:'children'

            },
            // 动态参数列表数据
            manyTableData:[],
            // 静态属性列表数据
            onlyTableData:[],
            // 上传的图片的url地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的header请求头对象
            headerObj:{
                Authorization:
                window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false,

        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res } = await this.$http.get(`categories`)

            if(res.meta.status !== 200){
                return this.$message.error("获取商品分类数据失败！")
            }
            this.catelist = res.data
            console.log(this.catelist);
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
                this.$message.error("请选择三级分类！")
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error("请选择三级分类！")
                return false
            }
        },
        async tabClicked(){
            // 证明访问的是动态参数面板,从而发起请求获取数据
            if(this.activeIndex === '1'){
                const {data:res } = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'many'}
                })
                if(res.meta.status !== 200){
                return this.$message.error('获取动态参数列表失败！')
            }
                console.log(res.data);
                // 把获取的attr_vals变成数组
                res.data.forEach(item => {
                    item.attr_vals =
                    item.attr_vals===0?[]:
                    item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }
            if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'only'}
                })

                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性失败！')
                }
                console.log(res.data);
                this.onlyTableData = res.data
            }
            
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file);
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file)
            // 1.获取图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从 pics 数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x =>{
                x.pic === filePath
            }
            )
            // 3.调用数组的 splice 方法，把图片信息对象，
            // 从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            console.log(response);
            // 1.拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项！')
                }
                //执行添加的业务逻辑
                // lodash  cloneDeep(obj)
                const form = _.cloneDeep(this.addForm) 
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数
                this.manyTableData.forEach(item =>{
                    const newInfo = 
                    {attr_id:item.attr_id,
                    attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = 
                    {attr_id:item.attr_id,
                    attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form);

                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const {data:res} = await this.$http.post(`goods`,form)

                if(res.meta.status !== 201){
                    console.log(res.meta.status);
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }    
}
</script>
<style scoped>
.el-checkbox{
    margin: 0px 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>